<template>
  <div class="play-bar" :class="{show:!toggle}">
    <div @click="toggle=!toggle" class="item-up" :class="{turn: toggle}">
      <svg class="icon">
        <use xlink:href="#icon-jiantou-shang-cuxiantiao"></use>
      </svg>
    </div>
    <div class="kongjian">
      <!-- 上一首 -->
      <div class="item" @click.stop="prev">
        <svg class="icon">
          <use xlink:href="#icon-ziyuanldpi"></use>
        </svg>
      </div>
      <!-- 播放 -->
      <div class="item" @click.stop="togglePlay">
        <svg class="icon">
          <use :xlink:href="playButtonUrl"></use>
        </svg>
      </div>
      <!-- 下一首 -->
      <div class="item" @click.stop="next">
        <svg class="icon">
          <use xlink:href="#icon-ziyuanldpi1"></use>
        </svg>
      </div>
      <!-- 歌曲图片 -->
      <div class="item-img" @click.stop="toLyric">
        <img :src="attachImageUrl(picUrl)" v-if="picUrl"/>
      </div>
      <!-- 播放进度 -->
      <div class="playing-speed">
        <!-- 播放开始时间 -->
        <div class="current-time">{{ nowTime }}</div>
        <div class="progress-box">
          <div class="item-song-title">
            <div>{{ this.title }}</div>
            <div>{{ this.artist }}</div>
          </div>
          <div ref="progress" class="progress" @mousemove="mousemove">
            <!-- 进度条 -->
            <div ref="bg" class="bg" @click="updatemove">
              <div ref="curProgress" class="cur-progress" :style="{width:curLength+'%'}"></div>
            </div>
            <!-- 拖动的点点 -->
            <div ref="idot" class="idot" :style="{left:curLength+'%'}" @mousedown="mousedown" @mouseup="mouseup"></div>
          </div>
        </div>
        <!-- 播放结束时间 -->
        <div class="left-time">{{ songTime }}</div>
        <!-- 音量 -->
        <div class="item item-volume">
          <svg v-if="volume == 0" class="icon">
            <use xlink:href="#icon-yinliangjingyinheix"></use>
          </svg>
          <svg v-else class="icon">
            <use xlink:href="#icon-yinliang1"></use>
          </svg>
          <el-slider class="volume" v-model="volume" :vertical="true"></el-slider>
        </div>
        <!-- 收藏 -->
        <div class="item" @click="collection">
          <svg :class="{active:isActive}" class="icon">
            <use xlink:href="#icon-xihuan-shi"></use>
          </svg>
        </div>
        <!-- 下载 -->
        <!--        <div class="item" @click="download">
                  <svg class="icon">
                    <use xlink:href="#icon-xiazai"></use>
                  </svg>
                </div>-->
        <!-- 当前播放的歌曲列表 -->
        <div class="item" @click.stop="changeAside">
          <svg class="icon">
            <use xlink:href="#icon-liebiao"></use>
          </svg>
        </div>

      </div>
    </div>
  </div>
</template>
<script>
import {mapGetters} from 'vuex';

export default {
  name: 'play-bar',
  data() {
    return {
      nowTime: '00:00',        //当前播放进度的时间
      songTime: '00:00',        //当前歌曲总时间
      curLength: 0,            //进度条的位置
      progressLength: 0,      //进度条的总长度
      mouseStartX: 0,      //拖拽开始位置
      tag: false,             //拖拽开始结束的标志，当开始拖拽，它的值才会变成true
      volume: 50,             //音量，默认一半
      toggle: true,            //显示隐藏播放器页面
      openLyric: false        //歌词是否开启
    }
  },
  computed: {
    ...mapGetters([
      'id',               //歌曲id
      'url',              //歌曲地址
      'isPlay',           //播放状态
      'playButtonUrl',   //播放状态的图标
      'picUrl',            //正在播放的音乐的图片
      'title',                  //歌名
      'artist',                 //歌手名
      'duration',                //音乐时长
      'curTime',                //当前音乐的播放位置
      'showAside',            //是否显示播放中的歌曲列表
      'listIndex',            //当前歌曲在歌单中的位置
      'listOfSongs',          //当前歌单列表
      'autoNext',             //自动播放下一首
      'loginIn',              //用户是否已登录
      'userId',               //当前登录用户的id
      'isActive',             //当前播放的歌曲是否已收藏
    ])
  },
  watch: {
    //切换播放状态的图标
    isPlay() {
      if (this.isPlay) {
        this.$store.commit('setPlayButtonUrl', '#icon-zanting');
      } else {
        this.$store.commit('setPlayButtonUrl', '#icon-bofang');
      }
    },
    curTime() {
      this.nowTime = this.formatSeconds(this.curTime);
      this.songTime = this.formatSeconds(this.duration);
      this.curLength = (this.curTime / this.duration) * 100;
    },
    //音量变化
    volume() {
      this.$store.commit('setVolume', this.volume / 100);
    },
    //自动播放下一首
    autoNext() {
      this.next();
    }
  },
  mounted() {
    this.progressLength = this.$refs.progress.getBoundingClientRect().width;
    document.querySelector('.item-volume').addEventListener('click', function (e) {
      document.querySelector('.volume').classList.add('show-volume');
      e.stopPropagation();
    }, false);
    document.querySelector('.volume').addEventListener('click', function (e) {
      e.stopPropagation();
    }, false);
    document.addEventListener('click', function () {
      document.querySelector('.volume').classList.remove('show-volume');
    }, false);
  },
  methods: {
    //提示信息
    notify(title, type) {
      this.$notify({
        title: title,
        type: type
      })
    },
    //控制音乐播放、暂停
    togglePlay() {
      if (this.isPlay) {
        this.$store.commit('setIsPlay', false);
      } else {
        this.$store.commit('setIsPlay', true);
      }
    },
    //解析时间
    formatSeconds(value) {
      let theTime = parseInt(value);
      let result = '';    //返回值
      let hour = parseInt(theTime / 3600);    //小时
      let minute = parseInt((theTime / 60) % 60); //分钟
      let second = parseInt(theTime % 60);        //秒
      if (hour > 0) {
        if (hour < 10) {
          result = '0' + hour + ":";
        } else {
          result = hour + ":";
        }
      }
      if (minute > 0) {
        if (minute < 10) {
          result += "0" + minute + ":";
        } else {
          result += minute + ":";
        }
      } else {
        result += "00:";
      }
      if (second > 0) {
        if (second < 10) {
          result += "0" + second;
        } else {
          result += second;
        }
      } else {
        result += "00";
      }
      return result;
    },
    //拖拽开始
    mousedown(e) {
      this.mouseStartX = e.clientX;
      this.tag = true;
    },
    //拖拽结束
    mouseup() {
      this.tag = false;
    },
    //拖拽中
    mousemove(e) {
      if (!this.duration) {
        return false;
      }
      if (this.tag) {
        let movementX = e.clientX - this.mouseStartX;       //点点移动的距离
        let curLength = this.$refs.curProgress.getBoundingClientRect().width;
        let newPercent = ((movementX + curLength) / this.progressLength) * 100;
        if (newPercent > 100) {
          newPercent = 100;
        }
        this.curLength = newPercent;
        this.mouseStartX = e.clientX;
        this.changeTime(newPercent);
      }
    },
    //更改歌曲进度
    changeTime(percent) {
      let newCurTime = (percent * 0.01) * this.duration;
      this.$store.commit('setChangeTime', newCurTime);
    },
    //点击播放条切换播放进度
    updatemove(e) {
      if (!this.tag) {
        //进度条的左侧坐标
        let curLength = this.$refs.bg.offsetLeft;
        let newPercent = ((e.clientX - curLength) / this.progressLength) * 100;
        if (newPercent > 100) {
          newPercent = 100;
        } else if (newPercent < 0) {
          newPercent = 0;
        }
        this.curLength = newPercent;
        this.changeTime(newPercent);
      }
    },
    //显示播放中的歌曲列表
    changeAside() {
      this.$store.commit('setShowAside', true);
    },
    //上一首
    prev() {
      if (this.listIndex != -1 && this.listOfSongs.length > 1) {    //当前处于不可能状态或者只有只有一首音乐的时候不执行）
        if (this.listIndex > 0) {                                 //不是第一首音乐
          this.$store.commit('setListIndex', this.listIndex - 1);  //直接返回上一首
        } else {                                                  //当前是第一首音乐
          this.$store.commit('setListIndex', this.listOfSongs.length - 1);  //切换到倒数第一首
        }
        this.toplay(this.listOfSongs[this.listIndex].url);
      }
    },
    //下一首
    next() {
      if (this.listIndex != -1 && this.listOfSongs.length > 1) {    //当前处于不可能状态或者只有只有一首音乐的时候不执行）
        if (this.listIndex < this.listOfSongs.length - 1) {                                 //不是最后一首音乐
          this.$store.commit('setListIndex', this.listIndex + 1);  //直接返回下一首
        } else {                                                      //当前是最后一首音乐
          this.$store.commit('setListIndex', 0);  //切换到第一首
        }
        this.toplay(this.listOfSongs[this.listIndex].url);
      }
    },
    //播放音乐
    toplay: function (url) {
      if (url && url != this.url) {
        this.$store.commit('setId', this.listOfSongs[this.listIndex].id);
        this.$store.commit('setUrl', url);
        this.$store.commit('setPicUrl', this.listOfSongs[this.listIndex].pic);
        this.$store.commit('setTitle', this.listOfSongs[this.listIndex].name);
        this.$store.commit('setArtist',this.listOfSongs[this.listIndex].name);
        this.$store.commit('setLyric', this.parseLyric(this.listOfSongs[this.listIndex].lyric));
        this.$store.commit('setIsActive', false);
        if (this.loginIn) {
          /*getCollectOfUserId(this.userId)
            .then(res => {
              for (let item of res) {
                if (item.songId == id) {
                  this.$store.commit('setIsActive', true);
                  break;
                }
              }
            })*/
        }
      }
    },
    //获取名字前半部分--歌手名
    replaceLName(str) {
      let arr = str.split('-');
      return arr[0];
    },
    //获取名字后半部分--歌名
    replaceFName(str) {
      let arr = str.split('-');
      return arr[1];
    },
    //解析歌词
    parseLyric(text) {
      let lines = text.split("\n");                   //将歌词按行分解成数组
      let pattern = /\[\d{2}:\d{2}.(\d{3}|\d{2})\]/g; //时间格式的正则表达式
      let result = [];                                //返回值
      //对于歌词格式不对的直接返回
      if (!(/\[.+\]/.test(text))) {
        return [[0, text]]
      }
      //去掉前面格式不正确的行
      while (!pattern.test(lines[0])) {
        lines = lines.slice(1);
      }
      //遍历每一行，形成一个每行带着俩元素的数组，第一个元素是以秒为计算单位的时间，第二个元素是歌词
      for (let item of lines) {
        let time = item.match(pattern);  //存前面的时间段
        let value = item.replace(pattern, '');//存后面的歌词
        for (let item1 of time) {
          let t = item1.slice(1, -1).split(":");   //取出时间，换算成数组
          if (value != '') {
            result.push([parseInt(t[0], 10) * 60 + parseFloat(t[1]), value]);
          }
        }
      }
      //按照第一个元素--时间--排序
      result.sort(function (a, b) {
        return a[0] - b[0];
      });
      return result;
    },
    //转向歌词页面
    toLyric() {
      if (this.openLyric == false) {
        this.$router.push({path: `/music/lyric`});
        this.openLyric = true;
      } else {
        this.$router.go(-1);
        this.openLyric = false;
      }
    },
    //下载音乐******
    download() {
      download(this.url)
        .then(res => {
          //触发下载
          let content = res.data;
          let eleLink = document.createElement('a');
          eleLink.download = `${this.artist}-${this.title}.mp3`;
          eleLink.style.display = 'none';
          //把字符内容转换成blob地址
          let blob = new Blob([content]);
          eleLink.href = URL.createObjectURL(blob);
          //把链接地址加到document里
          document.body.appendChild(eleLink);
          //触发点击
          eleLink.click();
          //然后移除掉这个新加的控件
          document.body.removeChild(eleLink);
          console.log(" download success")
        })
        .catch(err => {
          console.log(err);
        })
    },
    //收藏
    collection() {
      if (this.loginIn) {
        var params = new URLSearchParams();
        params.append('userId', this.userId);
        params.append('type', 0);
        params.append('songId', this.id);
        /*setCollect(params)
          .then(res => {
            if (res.code == 1) {
              this.$store.commit('setIsActive', true);
              this.notify('收藏成功', 'success');
            } else if (res.code == 2) {
              this.notify('已收藏', 'warning');
            } else {
              this.notify('收藏失败', 'error');
            }
          })*/
      } else {
        this.notify('请先登录', 'warning');
      }
    },
    //获取图片地址
    attachImageUrl(srcUrl) {
      return process.env.VUE_APP_BASE_API + srcUrl;
    },
  }
}
</script>
<style lang="scss" scoped>
@import '~@/assets/css/index.scss';
@import '~@/assets/css/play-bar.scss';
</style>
